NAME    [Toc]    [Back]

       glPrioritizeTextures - set texture residence priority

SYNOPSIS    [Toc]    [Back]

       void glPrioritizeTextures(
               GLsizei n,
               const GLuint *textures,
               const GLclampf *priorities );

PARAMETERS    [Toc]    [Back]

       Specifies the number of textures to be prioritized.  Specifies
 an array containing the names of the textures to  be
       prioritized.   Specifies  an  array containing the texture
       priorities. A priority given in an element  of  priorities
       applies  to the texture named by the corresponding element
       of textures.

DESCRIPTION    [Toc]    [Back]

       glPrioritizeTextures() assigns the  n  texture  priorities
       given in priorities to the n textures named in textures.

       The  GL establishes a ``working set'' of textures that are
       resident in texture memory. These textures may be bound to
       a  texture target much more efficiently than textures that
       are not resident. By specifying a priority for  each  texture,
  glPrioritizeTextures() allows applications to guide
       the GL implementation in determining which textures should
       be resident.

       The  priorities  given  in  priorities  are clamped to the
       range [0,1] before they are assigned. 0 indicates the lowest
 priority; textures with priority 0 are least likely to
       be resident. 1 indicates the  highest  priority;  textures
       with  priority 1 are most likely to be resident.  However,
       textures are not guaranteed to be resident until they  are
       used.

       glPrioritizeTextures() silently ignores attempts to prioritize
 texture 0, or any texture name that does not  correspond
 to an existing texture.

       glPrioritizeTextures()  does  not  require that any of the
       textures named by textures be bound to a  texture  target.
       glTexParameter()  may also be used to set a texture's priority,
 but only if the texture is currently bound. This is
       the only way to set the priority of a default texture.

NOTES    [Toc]    [Back]

       glPrioritizeTextures() is available only if the GL version
       is 1.1 or greater.

ERRORS    [Toc]    [Back]

       GL_INVALID_VALUE is generated if n is negative.

       GL_INVALID_OPERATION  is  generated  if   glPrioritizeTextures()
 is executed between the execution of glBegin() and
       the corresponding execution of glEnd().

ASSOCIATED GETS    [Toc]    [Back]

       glGetTexParameter() with parameter name  GL_TEXTURE_PRIORITY
 retrieves the priority of a currently bound texture.

SEE ALSO    [Toc]    [Back]

       glAreTexturesResident(3),  glBindTexture(3),  glCopyTexImage2D(3), glCopyTexImage1D(3),  glTexImage1D(3),  glTexImage2D(3), glTexImage3D(3), glTexParameter(3)



                                         glPrioritizeTextures(3G)